Biosorption of uranium(VI) from aqueous solution using calcium alginate beads

Gök, Cem; Aytaş, Şule

doi:10.1016/j.jhazmat.2009.02.063

Cited by 189 publications

(58 citation statements)

References 46 publications

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“…Na-alginate reacts with CaCl 2 to form beads and Ca cross-linked alginate was formed [7]. Also, hydroxyapatite and magnetite were enclosed in beads.…”

Section: A Preparation Of Adsorbentmentioning

confidence: 99%

“…The process of biosorption is a good alternative for sequestering lanthanides from aqueous solution because of its simple, relatively low-cost, effective and environmental friendliness properties. Biosorption is a property of certain types of inactive, dead, microbial biomass to bind and concentrate heavy metals/radionuclides from even very dilute aqueous solutions [4]- [7]. Lanthanides or radionuclides sequestration by different parts of the cell can occur via; complexation, chelation of metals, adsorption, coordination, ion exchange and inorganic microprecipitation.…”

Section: Introductionmentioning

confidence: 99%

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Equilibrium, Kinetic and Thermodynamic Studies of Europium Adsorption by Biopolymeric Composite

Gök¹

2017

IJCEA

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Abstract-Biopolymers materials can be used for many applications in various areas. In this study, prepared magnetic alginate/hydroxyapatite biopolymeric composites were used for removal of europium from aqueous solution. In this respect, the physicochemical parameters of adsorption process are investigated for optimum uptake conditions. Sorption mechanisms will be investigated using experimental results and calculated parameters from some models as thermodynamic, isothermal and kinetic. The results suggest that these materials were proven to be potent material with chemical adsorption mechanism for reducing the concentration of europium with high efficiency in aqueous solution. Due to the high sorption capacity as 250.0 mg/g of the prepared material, plus its easy preparation process, economic advantage and environmental friendly nature would make these composites a promising removal and recovery agent for lanthanides.

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“…Na-alginate reacts with CaCl 2 to form beads and Ca cross-linked alginate was formed [7]. Also, hydroxyapatite and magnetite were enclosed in beads.…”

Section: A Preparation Of Adsorbentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Equilibrium, Kinetic and Thermodynamic Studies of Europium Adsorption by Biopolymeric Composite

Gök¹

2017

IJCEA

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“…Therefore, in subsequent experiments, 90 min was deemed more than sufficient to establish equilibrium and used in all subsequent measurements. Gok and Aytas (2009) reported that equilibrium was reached after 90 min during biosorption of U(VI) from aqueous solution using calcium alginate beads.…”

Section: Effect Of Contact Timementioning

confidence: 99%

“…The United States Environment Protection Agency (US-EPA) has set the maximum acceptable level of 30 lg/L and World Health Organization (WHO) strictly recommended a 2 lg/L as the maximum contaminant level (MCL) for uranium (Saifuddin and Dinara 2012). Therefore, the need for economic and effective methods for the removal of uranium and other toxic pollutants from the environment resulted in the development of new separation techniques (Gok and Aytas 2009).…”

Section: Introductionmentioning

confidence: 99%

Removal of uranium(VI) from aqueous solutions using Eucalyptus citriodora distillation sludge

Bhatti

Hamid

2013

Int. J. Environ. Sci. Technol.

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Adsorption and desorption of uranium(VI) from dilute aqueous solutions by Eucalyptus citriodora distillation sludge was studied in a batch mode. The potential of Eucalyptus citriodora distillation sludge to remove uranium(VI) from aqueous solutions has been investigated at different conditions of solution pH, metal ion concentrations, biosorbent dosage, biosorbent particle size, contact time and temperature. The results indicated that biosorption capacity of Eucalyptus citriodora distillation sludge was strongly affected by the medium pH, the biosorbent dose, metal ion concentrations and medium temperature. Reduction in particle size increased the biosorption capacity. Langmuir and Freundlich isotherm models were applied to biosorption data to determine the biosorption characteristics. An optimum biosorption capacity (57.75 mg/g) was achieved with pH 4.0, particle size 0.255 mm, biosorbent dose 0.5 g/100 mL and initial uranium(VI) concentration of 100 mg/L. Uranium(VI) removal by Eucalyptus citriodora distillation sludge was rapid, the equilibrium was established within 60 min and pseudo-second-order model was found to fit with the experimental data. The biosorption process decreased with an increase in the temperature indicating its exothermic nature. Pretreatments of biomass with different reagents affected its biosorption capacity. A significant increase (34 %) in biosorption capacity (83.25 mg/g) was observed with benzene treatment. Fourier-transform infra-red studies showed the involvement of carbonyl, carboxyl and amide groups in the biosorption process. The results indicated that sulfuric acid had the best effects as an eluent showing 93.24 % desorption capacity.

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“…In view of the extensive usage of uranium and thorium for various industrial purposes and their sub trace level releases through liquid effluents which in turn reflects into the various aquatic medium (Gok and Aytas 2009;Basu et al 2011;Singhal et al 2011a, b). As per the recent works carried out in India (Singh et al 1995;Singh et al 2008), many location in the northern part of India (Punjab and Haryana) elevated levels of U was observed in groundwater.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of silica microsphere and their application in removal of uranium and thorium from water

Basu

Singhal

Pimple

et al. 2014

Int. J. Environ. Sci. Technol.

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Uranium (U) and thorium (Th) are known to cause acute toxicological effects in human, and their compounds are potential occupational carcinogens. During this work, silica microspheres were used to decontaminate the traces of U and Th in different water sources originated from groundwater and lake water. Ultra-filtration technique was used to isolate the microsphere from the water samples. Silica microspheres were synthesized based on a polyvinylpyrrolidone involved emulsion polymerization and subsequent sol-gel process. The microspheres were characterized for their size by using dynamic light scattering, and presence of silicate structure is verified by recording their attenuated total reflectance-Fourier transform infrared spectrum. The surface morphologies of the prepared silica microspheres were studied by using scanning electron microscope. Water samples collected from the groundwater and lake water were spiked with U and Th in the concentration range of 100-1,000 ng mL -1 . The results of batch sorption experiments suggest that silica microsphere is very effective at pH 3, and sorption is more than 99.9 %. Equilibrium sorption follows Langmuir isotherms and the maximum U, and Th uptake is 30 and 36 mg g -1 , respectively. Major physicochemical characteristics of the water were monitored before and after the decontamination process. Experimental results show no significant variations in any of the measured parameters.

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Biosorption of uranium(VI) from aqueous solution using calcium alginate beads

Cited by 189 publications

References 46 publications

Equilibrium, Kinetic and Thermodynamic Studies of Europium Adsorption by Biopolymeric Composite

Equilibrium, Kinetic and Thermodynamic Studies of Europium Adsorption by Biopolymeric Composite

Removal of uranium(VI) from aqueous solutions using Eucalyptus citriodora distillation sludge

Synthesis and characterization of silica microsphere and their application in removal of uranium and thorium from water

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